深层裂缝性致密碎屑岩气藏高效储渗区识别——以川西新场气田上三叠统须家河组气藏为例
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摘要
四川盆地西部深层上三叠统须家河组须二段致密碎屑岩气藏非均质性极强,准确预测规模裂缝网络与相对优质储层叠加形成的高效储渗区分布规律是勘探开发钻井获得高产稳产井的技术关键。以三维三分量地震勘探资料为基础,通过高效储渗区储层测井及波阻抗特征、地震响应特征对比分析、模型正演验证等方法,建立"杂乱弱反射"地震暗点高效储渗区识别模式,划分出PP波/PS波"单弱"及"双弱"2种暗点类型,解剖了其地质及地球物理成因机理,提出"双弱"模式为最优类型。利用对杂乱弱反射的吸收增强处理及像素成像暗点可视化刻画等技术手段,预测出了高效储渗区。
The tight detrital gas reservoirs in the second member of the Upper Triassic Xujiahe Formation(T3x2)in western Sichuan Basin are featured by strong heterogeneity.Sizable fracture networks,together with relatively quality reservoirs,result in high efficiency payzones with high permeability,is critical to the success of exploration and development in drilling.Based on 3D 3C seismic data,we performed correlation of logging and wave impedance features with seismic responses,and forward modeling.We built up a model to identify high efficiency payzones with high permeability by using dim spots of "weak chaotic reflection",and then identified two types of dim spots,i.e."single weak" and "double weak" of PP-and PS-wave.Based on an analysis of their geological and geophysical genetic mechanisms,the "double weak" mode is believed to be the optimal.High efficiency payzones with high permeability are identified through absorption-enhancing processing of the weak chaotic reflection and visualization of pixel image.
The tight detrital gas reservoirs in the second member of the Upper Triassic Xujiahe Formation(T3x2)in western Sichuan Basin are featured by strong heterogeneity.Sizable fracture networks,together with relatively quality reservoirs,result in high efficiency payzones with high permeability,is critical to the success of exploration and development in drilling.Based on 3D 3C seismic data,we performed correlation of logging and wave impedance features with seismic responses,and forward modeling.We built up a model to identify high efficiency payzones with high permeability by using dim spots of "weak chaotic reflection",and then identified two types of dim spots,i.e."single weak" and "double weak" of PP-and PS-wave.Based on an analysis of their geological and geophysical genetic mechanisms,the "double weak" mode is believed to be the optimal.High efficiency payzones with high permeability are identified through absorption-enhancing processing of the weak chaotic reflection and visualization of pixel image.
引文
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[14]程冰洁,徐天吉.地震信号的多尺度频率与吸收属性[J].新疆石油地质,2008,29(3):314-317.
[2]杨克明.川西坳陷须家河组天然气成藏模式探讨[J].石油与天然气地质,2006,27(6):786-793.
[3]唐建明.川西坳陷致密非均质气藏储层空间展布刻画[J].天然气工业,2002,22(4):19-23.
[4]朱仕军,李其荣,刘旭宁,等.梁董庙构造须家河组砂岩储层地震预测研究[J].西南石油学院学报,2006,28(2):8-10.
[5]刘鹏程,王晓冬,李素珍.地层压敏对低渗透气井产能影响研究[J].西南石油学院学报,2004,26(5):37-41.
[6]黄继祥,朱仕军,曾伟,等.川中—川南过渡带上三叠统天然气聚集的储渗体圈闭模型[J].天然气工业,1996,16(3):5-8.
[7]张虹.储渗体差异识别[J].石油物探,1999,38(4):81-88.
[8]任山.致密砂岩气藏勘探早期储渗体动态响应识别及分类[J].天然气勘探与开发,2004,27(3):25-30.
[9]叶泰然.基于波形的波阻抗特征识别技术在川西气田储层预测中的应用[J].石油物探,2005,44(6):632-635.
[10]彭才,朱仕军,孙建库,等.波阻抗混合优化反演方法研究[J].西南石油学院学报,2006,28(5):26-28.
[11]CARARELLI B,MADTSON E,KRAIL P,et al.3-D gas cloud imaging of the Donald Field with converted waves[J].SEG Expanded Abstracts2000(19):1158-1161.
[12]石玉梅,姚逢昌,曹宏.多波多分量天然气勘探技术的进展[J].勘探地球物理进展,2003,26(3):173-177.
[13]赵邦六.多分量地震勘探在岩性气藏勘探开发中的应用[J].石油勘探与开发,2008,35(4):397-409.
[14]程冰洁,徐天吉.地震信号的多尺度频率与吸收属性[J].新疆石油地质,2008,29(3):314-317.
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